|
1. 现在完成进行时的定义 现在完成进行时表示某动作从过去某个时间开始，一直延续到现在，并且还有可能持续下去。 We have been waiting for him for two hours. 2. 现在完成进行时的结构 have/has been + doing 3. 现在完成进行时的应用 现在完成进行时所用的时间状语：this month/week/year, these days, recently/latelyin the past few+时间段, since +时间点for+时间段。 They have been building the bridge for two months. They have been planting trees this month. 这个月他们在植树。 4. 现在完成进行时的用法 1) 表示动作的延续 The Chinese have been making paper for two thousand years. 中国有2000年的造纸历史。（动作还将继续下去） I have been learning English since three years ago.自从三年前以来我一直在学英语。 表示在说话时刻之前刚刚结束的动作。 We have been waiting for you for half an hour. 我们已经等你半个钟头了。（动作不再继续下去） 有些现在完成进行时的句子等同于现在完成时的句子。 They have been living in this city for ten years.They have lived in this city for ten years. | 
